Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Samsung - 9100 PRO 2TB | Samsung - 990 PRO 2TB |
|---|---|---|
| Sequential read | 14800 MB/s | 7450 MB/s |
| Sequential write | 13400 MB/s | 6900 MB/s |
| Interface | PCIe 5.0 x4 | PCIe 4.0 x4 |
Between the 9100 PRO 2TB and 990 PRO 2TB, the 9100 PRO 2TB comes out ahead in sequential read / sequential write, while the 990 PRO 2TB wins on several specs. Overall, the 9100 PRO 2TB scores 85.4 and the 990 PRO 2TB scores 69.2 on our Mars Score.
Which should you buy?
The 9100 PRO 2TB is the clear pick on raw spec strength, leading by 16.2 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the 9100 PRO 2TB if you care most about sequential read / sequential write. The biggest gaps in its favor are sequential read, sequential write, interface. The single most decisive one: Sequential read — 98.66% more. 14800 MB/s vs 7450 MB/s.
The 990 PRO 2TB similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable capacity, endurance (tbw), so those specs do not separate the two — focus on the differences below.
Bottom line: the 9100 PRO 2TB is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Samsung - 9100 PRO 2TB or Samsung - 990 PRO 2TB?
Samsung - 9100 PRO 2TB leads the current Mars Score by 16.2 points.The more useful decision is the trade-off behind that result: compare sequential read, sequential write, interface against the way you will actually use the product.
Choose Samsung - 9100 PRO 2TB if…
Samsung - 9100 PRO 2TB has the measurable edge on read mbps, write mbps, interface.
Choose Samsung - 990 PRO 2TB if…
Samsung - 990 PRO 2TB does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Samsung - 9100 PRO 2TB wins
- ▲Sequential read — 98.66% more. 14800 MB/s vs 7450 MB/s.
- ▲Sequential write — 94.20% more. 13400 MB/s vs 6900 MB/s.
- ▲Interface: PCIe 5.0 x4 (vs PCIe 4.0 x4).
Why Samsung - 990 PRO 2TB wins
- No decisive advantages.
Spec comparison
Capacity
| Spec | Samsung - 9100 PRO 2TB | Samsung - 990 PRO 2TB |
|---|---|---|
| Capacity | 2000 GB | 2000 GB |
Performance
| Spec | Samsung - 9100 PRO 2TB | Samsung - 990 PRO 2TB |
|---|---|---|
| Sequential read | 14800 MB/slead | 7450 MB/s |
| Sequential write | 13400 MB/slead | 6900 MB/s |
| Interface | PCIe 5.0 x4lead | PCIe 4.0 x4 |
| Form factor | M.2 2280 | M.2 2280 |
Endurance
| Spec | Samsung - 9100 PRO 2TB | Samsung - 990 PRO 2TB |
|---|---|---|
| Endurance (TBW)ⓘ | 1200 | 1200 |
| Warranty | 5 yrs | 5 yrs |